The ST in a AMC position?
Or just play with a AMC instead of a ST
As for the balance of players in opponents half
could be
1 or 2 AMC
AML and AMR
1 or 2 ST
Just a suggestion
Ive a DC-DC-DC-DR then MC-M-C-M-C and AML-AMC-AMR
Still, remember that, what wourks for me, and what works for you, can not work for a 3rd poerson as each team have a different configuration, where the players that score and assist, are from different positions and so...